./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cmemrchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cmemrchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3a34687129125cc08371e7bb78f7bdb7a4f5274a9b22928fd388f593b6db6995 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 17:46:22,653 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 17:46:22,719 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 17:46:22,725 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 17:46:22,726 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 17:46:22,749 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 17:46:22,749 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 17:46:22,750 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 17:46:22,751 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 17:46:22,751 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 17:46:22,752 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 17:46:22,752 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 17:46:22,753 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 17:46:22,753 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 17:46:22,754 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 17:46:22,754 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 17:46:22,755 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 17:46:22,755 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 17:46:22,756 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 17:46:22,756 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 17:46:22,756 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 17:46:22,757 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 17:46:22,758 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 17:46:22,758 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 17:46:22,759 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 17:46:22,759 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 17:46:22,759 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 17:46:22,760 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 17:46:22,760 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 17:46:22,760 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 17:46:22,761 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 17:46:22,761 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 17:46:22,761 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 17:46:22,762 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 17:46:22,762 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 17:46:22,762 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 17:46:22,762 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 17:46:22,763 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 17:46:22,763 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 17:46:22,763 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 17:46:22,763 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:46:22,764 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 17:46:22,764 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 17:46:22,764 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 17:46:22,764 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 17:46:22,764 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 17:46:22,765 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 17:46:22,765 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 17:46:22,765 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3a34687129125cc08371e7bb78f7bdb7a4f5274a9b22928fd388f593b6db6995 [2023-12-02 17:46:23,021 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 17:46:23,040 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 17:46:23,043 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 17:46:23,044 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 17:46:23,044 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 17:46:23,046 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-memsafety/openbsd_cmemrchr-alloca-2.i [2023-12-02 17:46:25,751 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 17:46:25,974 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 17:46:25,975 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/sv-benchmarks/c/array-memsafety/openbsd_cmemrchr-alloca-2.i [2023-12-02 17:46:25,990 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/data/f821cafbb/d3f4c228c00b42edac5a0c8c3b1d7d84/FLAG5ae4a2a96 [2023-12-02 17:46:26,003 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/data/f821cafbb/d3f4c228c00b42edac5a0c8c3b1d7d84 [2023-12-02 17:46:26,006 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 17:46:26,008 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 17:46:26,009 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 17:46:26,009 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 17:46:26,014 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 17:46:26,015 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,016 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a9f423c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26, skipping insertion in model container [2023-12-02 17:46:26,017 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,061 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 17:46:26,312 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:46:26,324 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 17:46:26,364 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:46:26,394 INFO L206 MainTranslator]: Completed translation [2023-12-02 17:46:26,394 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26 WrapperNode [2023-12-02 17:46:26,395 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 17:46:26,396 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 17:46:26,396 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 17:46:26,396 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 17:46:26,403 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,416 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,438 INFO L138 Inliner]: procedures = 117, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 70 [2023-12-02 17:46:26,438 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 17:46:26,439 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 17:46:26,439 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 17:46:26,439 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 17:46:26,448 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,449 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,452 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,452 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,458 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,461 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,462 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,463 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,466 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 17:46:26,467 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 17:46:26,467 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 17:46:26,467 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 17:46:26,468 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (1/1) ... [2023-12-02 17:46:26,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:46:26,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:26,496 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 17:46:26,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 17:46:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 17:46:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 17:46:26,531 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 17:46:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 17:46:26,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 17:46:26,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 17:46:26,630 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 17:46:26,632 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 17:46:26,774 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 17:46:26,827 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 17:46:26,827 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 17:46:26,829 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:46:26 BoogieIcfgContainer [2023-12-02 17:46:26,829 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 17:46:26,832 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 17:46:26,832 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 17:46:26,836 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 17:46:26,836 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 05:46:26" (1/3) ... [2023-12-02 17:46:26,837 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67976982 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:46:26, skipping insertion in model container [2023-12-02 17:46:26,837 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:46:26" (2/3) ... [2023-12-02 17:46:26,838 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67976982 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:46:26, skipping insertion in model container [2023-12-02 17:46:26,838 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:46:26" (3/3) ... [2023-12-02 17:46:26,839 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cmemrchr-alloca-2.i [2023-12-02 17:46:26,861 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 17:46:26,861 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-12-02 17:46:26,903 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 17:46:26,910 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@a64c5c8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 17:46:26,910 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-12-02 17:46:26,915 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:26,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 17:46:26,921 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:26,922 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 17:46:26,923 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:26,928 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:26,929 INFO L85 PathProgramCache]: Analyzing trace with hash 107409, now seen corresponding path program 1 times [2023-12-02 17:46:26,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:26,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395468493] [2023-12-02 17:46:26,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:26,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:27,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:27,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:27,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:27,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395468493] [2023-12-02 17:46:27,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395468493] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:46:27,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:46:27,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 17:46:27,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879302180] [2023-12-02 17:46:27,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:46:27,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:46:27,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:27,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:46:27,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:46:27,293 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:27,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:27,331 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2023-12-02 17:46:27,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:46:27,333 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 17:46:27,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:27,341 INFO L225 Difference]: With dead ends: 16 [2023-12-02 17:46:27,341 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 17:46:27,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:46:27,347 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:27,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 10 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:27,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 17:46:27,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-12-02 17:46:27,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:27,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-12-02 17:46:27,377 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 3 [2023-12-02 17:46:27,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:27,377 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-12-02 17:46:27,378 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:27,378 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-12-02 17:46:27,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 17:46:27,378 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:27,378 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 17:46:27,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 17:46:27,379 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:27,380 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:27,380 INFO L85 PathProgramCache]: Analyzing trace with hash 107410, now seen corresponding path program 1 times [2023-12-02 17:46:27,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:27,380 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429592892] [2023-12-02 17:46:27,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:27,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:27,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:27,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:27,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:27,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429592892] [2023-12-02 17:46:27,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429592892] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:46:27,631 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:46:27,632 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 17:46:27,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065655727] [2023-12-02 17:46:27,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:46:27,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:46:27,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:27,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:46:27,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:46:27,634 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:27,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:27,686 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2023-12-02 17:46:27,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:46:27,686 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-12-02 17:46:27,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:27,687 INFO L225 Difference]: With dead ends: 17 [2023-12-02 17:46:27,687 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 17:46:27,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 17:46:27,689 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:27,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 33 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:27,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 17:46:27,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-12-02 17:46:27,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:27,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-12-02 17:46:27,695 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 3 [2023-12-02 17:46:27,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:27,695 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-12-02 17:46:27,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:27,695 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-12-02 17:46:27,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 17:46:27,696 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:27,696 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-12-02 17:46:27,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 17:46:27,696 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:27,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:27,697 INFO L85 PathProgramCache]: Analyzing trace with hash 103266916, now seen corresponding path program 1 times [2023-12-02 17:46:27,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:27,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563714738] [2023-12-02 17:46:27,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:27,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:27,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:27,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:27,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:27,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563714738] [2023-12-02 17:46:27,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563714738] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:27,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98018180] [2023-12-02 17:46:27,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:27,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:27,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:27,979 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:28,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 17:46:28,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:28,069 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 17:46:28,074 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:28,208 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 17:46:28,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:28,361 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:28,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:28,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98018180] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:28,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1310273889] [2023-12-02 17:46:28,494 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-12-02 17:46:28,494 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:28,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:28,504 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:28,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:29,309 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:29,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '129#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_#t~nondet10#1| 127) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetArea~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet10#1|)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)))' at error location [2023-12-02 17:46:29,521 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:29,521 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:29,522 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2023-12-02 17:46:29,522 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050244087] [2023-12-02 17:46:29,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:29,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 17:46:29,523 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:29,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 17:46:29,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-12-02 17:46:29,524 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:29,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:29,666 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2023-12-02 17:46:29,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 17:46:29,667 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-12-02 17:46:29,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:29,668 INFO L225 Difference]: With dead ends: 18 [2023-12-02 17:46:29,668 INFO L226 Difference]: Without dead ends: 18 [2023-12-02 17:46:29,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2023-12-02 17:46:29,670 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 2 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:29,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 92 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:46:29,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-12-02 17:46:29,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2023-12-02 17:46:29,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 12 states have (on average 1.5) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:29,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-12-02 17:46:29,674 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 5 [2023-12-02 17:46:29,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:29,674 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-12-02 17:46:29,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:29,674 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-12-02 17:46:29,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 17:46:29,675 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:29,675 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:46:29,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 17:46:29,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:29,876 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:29,876 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:29,876 INFO L85 PathProgramCache]: Analyzing trace with hash 456878074, now seen corresponding path program 1 times [2023-12-02 17:46:29,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:29,877 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658786188] [2023-12-02 17:46:29,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:29,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:29,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:29,953 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:29,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:29,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658786188] [2023-12-02 17:46:29,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658786188] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:46:29,954 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:46:29,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 17:46:29,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10252587] [2023-12-02 17:46:29,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:46:29,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 17:46:29,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:29,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 17:46:29,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 17:46:29,956 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:30,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:30,012 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2023-12-02 17:46:30,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:46:30,013 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 17:46:30,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:30,013 INFO L225 Difference]: With dead ends: 16 [2023-12-02 17:46:30,014 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 17:46:30,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-12-02 17:46:30,015 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 31 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:30,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 17 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:30,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 17:46:30,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2023-12-02 17:46:30,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:30,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-12-02 17:46:30,019 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2023-12-02 17:46:30,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:30,019 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-12-02 17:46:30,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 6 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:30,019 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-12-02 17:46:30,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 17:46:30,020 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:30,020 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:46:30,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 17:46:30,020 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:30,021 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:30,021 INFO L85 PathProgramCache]: Analyzing trace with hash 456878075, now seen corresponding path program 1 times [2023-12-02 17:46:30,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:30,021 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874850159] [2023-12-02 17:46:30,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:30,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:30,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:30,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:30,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:30,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874850159] [2023-12-02 17:46:30,347 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874850159] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:30,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778958817] [2023-12-02 17:46:30,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:30,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:30,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:30,349 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:30,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 17:46:30,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:30,413 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 36 conjunts are in the unsatisfiable core [2023-12-02 17:46:30,415 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:30,424 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 17:46:30,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:30,578 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:30,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:30,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778958817] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:30,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1840969460] [2023-12-02 17:46:30,917 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 17:46:30,917 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:30,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:30,918 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:30,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:31,367 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:31,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '265#(and (or (and (= (+ |ULTIMATE.start_cmemrchr_~cp~0#1.offset| 1) (mod |ULTIMATE.start_cmemrchr_~n#1| 4294967296)) (<= (mod |ULTIMATE.start_cmemrchr_~n#1| 4294967296) 2147483647)) (and (= (+ |ULTIMATE.start_cmemrchr_~cp~0#1.offset| 4294967297) (mod |ULTIMATE.start_cmemrchr_~n#1| 4294967296)) (<= 2147483648 (mod |ULTIMATE.start_cmemrchr_~n#1| 4294967296)))) (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (not (= (mod |ULTIMATE.start_cmemrchr_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cmemrchr_~n#1| |ULTIMATE.start_cmemrchr_#in~n#1|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_cmemrchr_~c#1| |ULTIMATE.start_cmemrchr_#in~c#1|) (= |ULTIMATE.start_cmemrchr_~cp~0#1.offset| |ULTIMATE.start_cmemrchr_#t~pre3#1.offset|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (= |ULTIMATE.start_cmemrchr_~cp~0#1.base| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_#t~pre3#1.base| |ULTIMATE.start_cmemrchr_~s#1.base|) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (= |ULTIMATE.start_main_~n~0#1| |ULTIMATE.start_cmemrchr_#in~n#1|) (= |ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_cmemrchr_#in~c#1|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.base| |ULTIMATE.start_cmemrchr_~s#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (= |ULTIMATE.start_cmemrchr_#in~s#1.base| |ULTIMATE.start_main_~nondetArea~0#1.base|))' at error location [2023-12-02 17:46:31,951 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:31,951 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:31,951 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 16 [2023-12-02 17:46:31,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015189697] [2023-12-02 17:46:31,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:31,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 17:46:31,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:31,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 17:46:31,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2023-12-02 17:46:31,953 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:32,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:32,757 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2023-12-02 17:46:32,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 17:46:32,757 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 17:46:32,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:32,758 INFO L225 Difference]: With dead ends: 56 [2023-12-02 17:46:32,759 INFO L226 Difference]: Without dead ends: 56 [2023-12-02 17:46:32,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=207, Invalid=1053, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 17:46:32,760 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 86 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:32,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 96 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:46:32,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-12-02 17:46:32,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 24. [2023-12-02 17:46:32,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:32,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 31 transitions. [2023-12-02 17:46:32,765 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 31 transitions. Word has length 7 [2023-12-02 17:46:32,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:32,766 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 31 transitions. [2023-12-02 17:46:32,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:32,766 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 31 transitions. [2023-12-02 17:46:32,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 17:46:32,767 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:32,767 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2023-12-02 17:46:32,772 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 17:46:32,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:32,971 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:32,972 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:32,972 INFO L85 PathProgramCache]: Analyzing trace with hash 516829726, now seen corresponding path program 1 times [2023-12-02 17:46:32,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:32,972 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619720142] [2023-12-02 17:46:32,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:32,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:32,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:33,043 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 17:46:33,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:33,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619720142] [2023-12-02 17:46:33,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619720142] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:46:33,044 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:46:33,044 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 17:46:33,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70288158] [2023-12-02 17:46:33,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:46:33,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:46:33,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:33,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:46:33,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:46:33,045 INFO L87 Difference]: Start difference. First operand 24 states and 31 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:33,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:33,058 INFO L93 Difference]: Finished difference Result 23 states and 30 transitions. [2023-12-02 17:46:33,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 17:46:33,059 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-12-02 17:46:33,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:33,059 INFO L225 Difference]: With dead ends: 23 [2023-12-02 17:46:33,059 INFO L226 Difference]: Without dead ends: 20 [2023-12-02 17:46:33,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:46:33,060 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:33,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 18 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:33,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-12-02 17:46:33,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-12-02 17:46:33,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:33,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-12-02 17:46:33,064 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 10 [2023-12-02 17:46:33,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:33,064 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-12-02 17:46:33,064 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:33,064 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-12-02 17:46:33,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 17:46:33,065 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:33,065 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:46:33,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 17:46:33,065 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:33,065 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:33,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1090164499, now seen corresponding path program 1 times [2023-12-02 17:46:33,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:33,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180407641] [2023-12-02 17:46:33,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:33,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:33,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:33,186 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:33,187 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:33,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180407641] [2023-12-02 17:46:33,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180407641] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:33,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973732095] [2023-12-02 17:46:33,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:33,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:33,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:33,188 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:33,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 17:46:33,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:33,256 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 17:46:33,257 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:33,283 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:33,363 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:33,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973732095] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:33,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1221036935] [2023-12-02 17:46:33,366 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:46:33,366 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:33,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:33,367 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:33,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:34,165 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:34,720 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '494#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:46:34,720 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:34,720 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:34,720 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-12-02 17:46:34,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493455424] [2023-12-02 17:46:34,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:34,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 17:46:34,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:34,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 17:46:34,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2023-12-02 17:46:34,722 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:34,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:34,805 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2023-12-02 17:46:34,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 17:46:34,806 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 17:46:34,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:34,807 INFO L225 Difference]: With dead ends: 24 [2023-12-02 17:46:34,807 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 17:46:34,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2023-12-02 17:46:34,809 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:34,809 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 32 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:34,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 17:46:34,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-12-02 17:46:34,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:34,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-12-02 17:46:34,812 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2023-12-02 17:46:34,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:34,813 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-12-02 17:46:34,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:34,813 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-12-02 17:46:34,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 17:46:34,814 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:34,814 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2023-12-02 17:46:34,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 17:46:35,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:35,019 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:35,019 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:35,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1633885169, now seen corresponding path program 2 times [2023-12-02 17:46:35,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:35,020 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446280579] [2023-12-02 17:46:35,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:35,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:35,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:35,434 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:35,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:35,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446280579] [2023-12-02 17:46:35,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446280579] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:35,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146261653] [2023-12-02 17:46:35,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:46:35,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:35,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:35,436 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:35,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 17:46:35,506 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-12-02 17:46:35,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:35,508 WARN L260 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 33 conjunts are in the unsatisfiable core [2023-12-02 17:46:35,510 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:35,536 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:46:35,785 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 17:46:35,786 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 17:46:35,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146261653] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:46:35,786 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 17:46:35,786 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 13 [2023-12-02 17:46:35,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048879586] [2023-12-02 17:46:35,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:46:35,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 17:46:35,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:35,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 17:46:35,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2023-12-02 17:46:35,788 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:35,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:35,971 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2023-12-02 17:46:35,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:46:35,971 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 17:46:35,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:35,972 INFO L225 Difference]: With dead ends: 22 [2023-12-02 17:46:35,972 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 17:46:35,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2023-12-02 17:46:35,973 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:35,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 5 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:46:35,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 17:46:35,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2023-12-02 17:46:35,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:35,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-12-02 17:46:35,976 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 13 [2023-12-02 17:46:35,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:35,976 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-12-02 17:46:35,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:35,976 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-12-02 17:46:35,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 17:46:35,977 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:35,977 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:46:35,981 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 17:46:36,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:36,179 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:36,180 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:36,180 INFO L85 PathProgramCache]: Analyzing trace with hash -1059549761, now seen corresponding path program 2 times [2023-12-02 17:46:36,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:36,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031467706] [2023-12-02 17:46:36,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:36,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:36,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:36,613 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:36,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:36,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031467706] [2023-12-02 17:46:36,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031467706] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:36,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094312975] [2023-12-02 17:46:36,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:46:36,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:36,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:36,615 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:36,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 17:46:36,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 17:46:36,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:36,714 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 46 conjunts are in the unsatisfiable core [2023-12-02 17:46:36,716 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:36,758 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:46:37,363 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:46:37,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:38,041 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:46:38,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094312975] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:38,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124852835] [2023-12-02 17:46:38,044 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:46:38,044 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:38,045 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:38,045 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:38,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:38,670 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:39,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '744#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:46:39,387 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:39,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:39,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 28 [2023-12-02 17:46:39,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292203050] [2023-12-02 17:46:39,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:39,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 17:46:39,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:39,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 17:46:39,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1256, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 17:46:39,390 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 30 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:41,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:41,147 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2023-12-02 17:46:41,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 17:46:41,148 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 17:46:41,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:41,148 INFO L225 Difference]: With dead ends: 31 [2023-12-02 17:46:41,148 INFO L226 Difference]: Without dead ends: 31 [2023-12-02 17:46:41,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=399, Invalid=3023, Unknown=0, NotChecked=0, Total=3422 [2023-12-02 17:46:41,151 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 102 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:41,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 2 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:46:41,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-12-02 17:46:41,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 22. [2023-12-02 17:46:41,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:41,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-12-02 17:46:41,154 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 13 [2023-12-02 17:46:41,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:41,154 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-12-02 17:46:41,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:41,155 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-12-02 17:46:41,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 17:46:41,155 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:41,156 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2023-12-02 17:46:41,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 17:46:41,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:41,356 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:41,357 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:41,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1674657117, now seen corresponding path program 3 times [2023-12-02 17:46:41,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:41,357 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332853942] [2023-12-02 17:46:41,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:41,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:41,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:41,496 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:46:41,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:41,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332853942] [2023-12-02 17:46:41,496 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [332853942] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:41,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991546528] [2023-12-02 17:46:41,497 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:46:41,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:41,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:41,498 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:41,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 17:46:41,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:46:41,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:41,582 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 33 conjunts are in the unsatisfiable core [2023-12-02 17:46:41,585 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:41,593 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:46:41,700 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 17:46:41,742 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 13 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:41,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:41,906 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:41,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991546528] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:41,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1896118496] [2023-12-02 17:46:41,908 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:46:41,908 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:41,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:41,909 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:41,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:42,389 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:42,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '991#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:46:42,976 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:42,976 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:42,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11] total 23 [2023-12-02 17:46:42,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516741561] [2023-12-02 17:46:42,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:42,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 17:46:42,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:42,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 17:46:42,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2023-12-02 17:46:42,978 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:43,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:43,281 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2023-12-02 17:46:43,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 17:46:43,281 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-12-02 17:46:43,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:43,282 INFO L225 Difference]: With dead ends: 34 [2023-12-02 17:46:43,282 INFO L226 Difference]: Without dead ends: 25 [2023-12-02 17:46:43,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=190, Invalid=1450, Unknown=0, NotChecked=0, Total=1640 [2023-12-02 17:46:43,283 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 34 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:43,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 37 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:46:43,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-12-02 17:46:43,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2023-12-02 17:46:43,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:43,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-12-02 17:46:43,286 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2023-12-02 17:46:43,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:43,287 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-12-02 17:46:43,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:43,287 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-12-02 17:46:43,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 17:46:43,288 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:43,288 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2023-12-02 17:46:43,292 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 17:46:43,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 17:46:43,488 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:43,489 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:43,489 INFO L85 PathProgramCache]: Analyzing trace with hash -16807691, now seen corresponding path program 4 times [2023-12-02 17:46:43,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:43,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584631608] [2023-12-02 17:46:43,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:43,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:43,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:43,685 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:43,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:43,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584631608] [2023-12-02 17:46:43,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584631608] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:43,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355776994] [2023-12-02 17:46:43,686 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:46:43,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:43,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:43,687 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:43,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 17:46:43,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:43,947 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 17:46:43,949 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:43,994 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:43,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:44,160 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:44,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355776994] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:44,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1554322434] [2023-12-02 17:46:44,162 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:46:44,162 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:44,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:44,163 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:44,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:44,608 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:45,150 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1229#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:46:45,150 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:45,150 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:45,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2023-12-02 17:46:45,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852596742] [2023-12-02 17:46:45,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:45,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 17:46:45,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:45,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 17:46:45,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2023-12-02 17:46:45,152 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:45,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:45,348 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2023-12-02 17:46:45,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 17:46:45,348 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-12-02 17:46:45,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:45,349 INFO L225 Difference]: With dead ends: 40 [2023-12-02 17:46:45,349 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 17:46:45,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=119, Invalid=1141, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 17:46:45,350 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:45,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 126 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:46:45,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 17:46:45,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2023-12-02 17:46:45,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:45,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2023-12-02 17:46:45,352 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2023-12-02 17:46:45,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:45,352 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2023-12-02 17:46:45,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:45,352 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2023-12-02 17:46:45,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 17:46:45,353 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:45,353 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2023-12-02 17:46:45,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 17:46:45,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:45,554 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:45,554 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:45,554 INFO L85 PathProgramCache]: Analyzing trace with hash -256376121, now seen corresponding path program 5 times [2023-12-02 17:46:45,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:45,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184055392] [2023-12-02 17:46:45,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:45,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:45,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:46,250 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:46,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:46,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184055392] [2023-12-02 17:46:46,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184055392] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:46,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595636303] [2023-12-02 17:46:46,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:46:46,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:46,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:46,251 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:46,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 17:46:46,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 17:46:46,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:46,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 67 conjunts are in the unsatisfiable core [2023-12-02 17:46:46,444 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:46,456 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:46:47,585 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 5 proven. 27 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:46:47,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:48,997 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 25 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:46:48,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595636303] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:48,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1595441179] [2023-12-02 17:46:48,999 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:46:48,999 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:48,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:48,999 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:48,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:49,417 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:50,422 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1509#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:46:50,422 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:50,422 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:50,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 16] total 48 [2023-12-02 17:46:50,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033698255] [2023-12-02 17:46:50,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:50,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 17:46:50,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:50,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 17:46:50,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=2992, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 17:46:50,425 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 50 states, 49 states have (on average 1.489795918367347) internal successors, (73), 49 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:54,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:46:54,521 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2023-12-02 17:46:54,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 17:46:54,521 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.489795918367347) internal successors, (73), 49 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2023-12-02 17:46:54,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:46:54,522 INFO L225 Difference]: With dead ends: 58 [2023-12-02 17:46:54,522 INFO L226 Difference]: Without dead ends: 58 [2023-12-02 17:46:54,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1821 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1044, Invalid=8462, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 17:46:54,526 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 145 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:46:54,527 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 56 Invalid, 666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 17:46:54,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-12-02 17:46:54,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2023-12-02 17:46:54,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:54,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2023-12-02 17:46:54,529 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 25 [2023-12-02 17:46:54,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:46:54,530 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2023-12-02 17:46:54,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.489795918367347) internal successors, (73), 49 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:46:54,530 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2023-12-02 17:46:54,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 17:46:54,531 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:46:54,531 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 4, 4, 1, 1, 1, 1] [2023-12-02 17:46:54,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 17:46:54,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 17:46:54,732 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:46:54,732 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:46:54,732 INFO L85 PathProgramCache]: Analyzing trace with hash 1856518287, now seen corresponding path program 6 times [2023-12-02 17:46:54,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:46:54,732 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361494939] [2023-12-02 17:46:54,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:46:54,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:46:54,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:46:55,014 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 56 proven. 40 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 17:46:55,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:46:55,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361494939] [2023-12-02 17:46:55,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361494939] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:46:55,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370657303] [2023-12-02 17:46:55,015 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:46:55,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:46:55,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:46:55,016 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:46:55,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 17:46:55,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:46:55,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:46:55,140 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 72 conjunts are in the unsatisfiable core [2023-12-02 17:46:55,144 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:46:55,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:46:55,564 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 44 proven. 66 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 17:46:55,565 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:46:56,865 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:46:56,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370657303] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:46:56,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108305075] [2023-12-02 17:46:56,867 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:46:56,868 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:46:56,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:46:56,868 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:46:56,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:46:57,332 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:46:58,156 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1982#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:46:58,156 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:46:58,156 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:46:58,157 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 18] total 44 [2023-12-02 17:46:58,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920591843] [2023-12-02 17:46:58,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:46:58,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-12-02 17:46:58,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:46:58,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-12-02 17:46:58,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2543, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 17:46:58,160 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 45 states, 45 states have (on average 2.3555555555555556) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:03,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:03,049 INFO L93 Difference]: Finished difference Result 105 states and 110 transitions. [2023-12-02 17:47:03,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-12-02 17:47:03,049 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.3555555555555556) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2023-12-02 17:47:03,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:03,050 INFO L225 Difference]: With dead ends: 105 [2023-12-02 17:47:03,050 INFO L226 Difference]: Without dead ends: 88 [2023-12-02 17:47:03,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1609 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=880, Invalid=7130, Unknown=0, NotChecked=0, Total=8010 [2023-12-02 17:47:03,053 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 175 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 857 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 857 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:03,053 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 136 Invalid, 884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 857 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 17:47:03,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-12-02 17:47:03,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 57. [2023-12-02 17:47:03,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:03,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2023-12-02 17:47:03,057 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 41 [2023-12-02 17:47:03,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:03,057 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2023-12-02 17:47:03,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.3555555555555556) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:03,057 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2023-12-02 17:47:03,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 17:47:03,058 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:03,058 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 1, 1, 1, 1] [2023-12-02 17:47:03,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 17:47:03,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 17:47:03,259 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:03,259 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:03,259 INFO L85 PathProgramCache]: Analyzing trace with hash -848597243, now seen corresponding path program 7 times [2023-12-02 17:47:03,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:03,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725473907] [2023-12-02 17:47:03,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:03,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:03,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:03,689 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 14 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:03,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:03,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725473907] [2023-12-02 17:47:03,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725473907] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:03,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902621991] [2023-12-02 17:47:03,690 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:47:03,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:03,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:03,691 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:03,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 17:47:03,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:03,841 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 36 conjunts are in the unsatisfiable core [2023-12-02 17:47:03,843 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:03,935 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 14 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:03,936 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:04,401 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 14 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:04,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902621991] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:04,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37124643] [2023-12-02 17:47:04,403 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:04,403 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:04,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:04,403 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:04,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:04,798 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:05,589 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2540#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:05,590 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:05,590 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:05,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2023-12-02 17:47:05,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314209133] [2023-12-02 17:47:05,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:05,590 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 17:47:05,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:05,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 17:47:05,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 17:47:05,592 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 37 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:06,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:06,327 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2023-12-02 17:47:06,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 17:47:06,327 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 37 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2023-12-02 17:47:06,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:06,328 INFO L225 Difference]: With dead ends: 86 [2023-12-02 17:47:06,328 INFO L226 Difference]: Without dead ends: 57 [2023-12-02 17:47:06,330 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=203, Invalid=3337, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 17:47:06,330 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 30 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:06,331 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 629 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:47:06,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-12-02 17:47:06,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-12-02 17:47:06,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:06,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2023-12-02 17:47:06,334 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 47 [2023-12-02 17:47:06,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:06,334 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2023-12-02 17:47:06,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 37 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:06,334 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2023-12-02 17:47:06,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 17:47:06,335 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:06,335 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 5, 5, 1, 1, 1, 1] [2023-12-02 17:47:06,340 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 17:47:06,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 17:47:06,536 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:06,536 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:06,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1652080685, now seen corresponding path program 8 times [2023-12-02 17:47:06,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:06,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932587111] [2023-12-02 17:47:06,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:06,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:06,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:06,867 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 70 proven. 65 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 17:47:06,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:06,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932587111] [2023-12-02 17:47:06,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932587111] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:06,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790471720] [2023-12-02 17:47:06,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:47:06,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:06,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:06,869 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:06,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 17:47:07,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-12-02 17:47:07,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:07,387 INFO L262 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 38 conjunts are in the unsatisfiable core [2023-12-02 17:47:07,391 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:07,402 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:47:07,645 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 17:47:07,853 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 108 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:07,853 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:08,454 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 114 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:08,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790471720] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:08,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [683765925] [2023-12-02 17:47:08,456 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:08,456 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:08,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:08,457 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:08,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:08,889 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:09,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3041#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:09,627 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:09,627 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:09,627 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19] total 45 [2023-12-02 17:47:09,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989843505] [2023-12-02 17:47:09,627 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:09,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 17:47:09,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:09,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 17:47:09,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=2633, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 17:47:09,629 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand has 46 states, 46 states have (on average 2.3043478260869565) internal successors, (106), 45 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:10,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:10,922 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2023-12-02 17:47:10,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 17:47:10,923 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.3043478260869565) internal successors, (106), 45 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2023-12-02 17:47:10,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:10,923 INFO L225 Difference]: With dead ends: 109 [2023-12-02 17:47:10,923 INFO L226 Difference]: Without dead ends: 57 [2023-12-02 17:47:10,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 96 SyntacticMatches, 5 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=848, Invalid=5958, Unknown=0, NotChecked=0, Total=6806 [2023-12-02 17:47:10,926 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 91 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:10,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 141 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 725 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:47:10,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-12-02 17:47:10,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-12-02 17:47:10,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:10,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2023-12-02 17:47:10,930 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 47 [2023-12-02 17:47:10,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:10,930 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2023-12-02 17:47:10,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.3043478260869565) internal successors, (106), 45 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:10,931 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2023-12-02 17:47:10,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-12-02 17:47:10,932 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:10,932 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 7, 7, 7, 1, 1, 1, 1] [2023-12-02 17:47:10,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 17:47:11,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 17:47:11,133 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:11,133 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:11,133 INFO L85 PathProgramCache]: Analyzing trace with hash 1816857129, now seen corresponding path program 9 times [2023-12-02 17:47:11,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:11,133 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128457988] [2023-12-02 17:47:11,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:11,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:11,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:12,165 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:12,166 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:12,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128457988] [2023-12-02 17:47:12,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128457988] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:12,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189378758] [2023-12-02 17:47:12,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:47:12,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:12,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:12,167 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:12,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 17:47:12,286 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:47:12,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:12,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 78 conjunts are in the unsatisfiable core [2023-12-02 17:47:12,293 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:12,299 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 17:47:13,684 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:13,684 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:15,987 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 81 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:15,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189378758] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:15,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251283245] [2023-12-02 17:47:15,989 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:15,989 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:15,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:15,989 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:15,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:16,429 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:17,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3641#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:17,432 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:17,432 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:17,432 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 21, 21] total 66 [2023-12-02 17:47:17,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365075863] [2023-12-02 17:47:17,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:17,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2023-12-02 17:47:17,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:17,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2023-12-02 17:47:17,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=5334, Unknown=0, NotChecked=0, Total=5700 [2023-12-02 17:47:17,436 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 68 states, 67 states have (on average 2.283582089552239) internal successors, (153), 67 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:21,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:21,771 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2023-12-02 17:47:21,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2023-12-02 17:47:21,772 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 2.283582089552239) internal successors, (153), 67 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2023-12-02 17:47:21,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:21,772 INFO L225 Difference]: With dead ends: 105 [2023-12-02 17:47:21,773 INFO L226 Difference]: Without dead ends: 105 [2023-12-02 17:47:21,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3281 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=1500, Invalid=13752, Unknown=0, NotChecked=0, Total=15252 [2023-12-02 17:47:21,775 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 183 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 1759 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 1783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:21,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 277 Invalid, 1783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1759 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 17:47:21,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-12-02 17:47:21,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 61. [2023-12-02 17:47:21,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:21,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2023-12-02 17:47:21,779 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 51 [2023-12-02 17:47:21,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:21,779 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2023-12-02 17:47:21,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 2.283582089552239) internal successors, (153), 67 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:21,779 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2023-12-02 17:47:21,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 17:47:21,780 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:21,780 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 1, 1, 1, 1] [2023-12-02 17:47:21,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 17:47:21,980 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 17:47:21,980 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:21,981 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:21,981 INFO L85 PathProgramCache]: Analyzing trace with hash -1867954743, now seen corresponding path program 10 times [2023-12-02 17:47:21,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:21,981 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358810478] [2023-12-02 17:47:21,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:21,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:22,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:22,452 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 16 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:22,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:22,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358810478] [2023-12-02 17:47:22,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358810478] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:22,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299124230] [2023-12-02 17:47:22,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:47:22,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:22,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:22,453 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:22,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 17:47:22,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:22,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 40 conjunts are in the unsatisfiable core [2023-12-02 17:47:22,618 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:22,715 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 16 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:22,715 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:23,227 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 16 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:23,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299124230] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:23,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788890889] [2023-12-02 17:47:23,229 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:23,229 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:23,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:23,229 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:23,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:23,624 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:24,353 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4265#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:24,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:24,354 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:24,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 41 [2023-12-02 17:47:24,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196330759] [2023-12-02 17:47:24,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:24,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2023-12-02 17:47:24,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:24,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2023-12-02 17:47:24,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2316, Unknown=0, NotChecked=0, Total=2450 [2023-12-02 17:47:24,356 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 42 states, 42 states have (on average 2.5714285714285716) internal successors, (108), 41 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:25,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:25,103 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2023-12-02 17:47:25,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 17:47:25,104 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.5714285714285716) internal successors, (108), 41 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2023-12-02 17:47:25,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:25,104 INFO L225 Difference]: With dead ends: 94 [2023-12-02 17:47:25,104 INFO L226 Difference]: Without dead ends: 61 [2023-12-02 17:47:25,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=224, Invalid=4066, Unknown=0, NotChecked=0, Total=4290 [2023-12-02 17:47:25,105 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 34 mSDsluCounter, 637 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 661 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:25,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 661 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 17:47:25,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-12-02 17:47:25,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2023-12-02 17:47:25,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:25,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2023-12-02 17:47:25,109 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 53 [2023-12-02 17:47:25,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:25,109 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2023-12-02 17:47:25,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.5714285714285716) internal successors, (108), 41 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:25,110 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2023-12-02 17:47:25,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-12-02 17:47:25,110 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:25,111 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2023-12-02 17:47:25,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-12-02 17:47:25,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 17:47:25,311 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:25,311 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:25,312 INFO L85 PathProgramCache]: Analyzing trace with hash 1069233421, now seen corresponding path program 11 times [2023-12-02 17:47:25,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:25,312 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175637849] [2023-12-02 17:47:25,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:25,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:25,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:25,764 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:25,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:25,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175637849] [2023-12-02 17:47:25,765 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175637849] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:25,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924738421] [2023-12-02 17:47:25,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:47:25,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:25,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:25,767 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:25,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 17:47:26,732 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-12-02 17:47:26,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:26,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 44 conjunts are in the unsatisfiable core [2023-12-02 17:47:26,737 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:26,813 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:26,814 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:27,429 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 18 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:27,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924738421] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:27,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1272153579] [2023-12-02 17:47:27,430 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:27,430 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:27,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:27,431 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:27,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:27,841 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:28,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4853#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:28,614 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:28,614 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:28,614 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2023-12-02 17:47:28,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687557121] [2023-12-02 17:47:28,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:28,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 17:47:28,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:28,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 17:47:28,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2718, Unknown=0, NotChecked=0, Total=2862 [2023-12-02 17:47:28,616 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:29,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:29,551 INFO L93 Difference]: Finished difference Result 100 states and 101 transitions. [2023-12-02 17:47:29,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 17:47:29,551 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2023-12-02 17:47:29,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:29,552 INFO L225 Difference]: With dead ends: 100 [2023-12-02 17:47:29,552 INFO L226 Difference]: Without dead ends: 63 [2023-12-02 17:47:29,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=245, Invalid=4867, Unknown=0, NotChecked=0, Total=5112 [2023-12-02 17:47:29,553 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 39 mSDsluCounter, 827 mSDsCounter, 0 mSdLazyCounter, 991 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 854 SdHoareTripleChecker+Invalid, 1001 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:29,553 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 854 Invalid, 1001 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 991 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:47:29,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-12-02 17:47:29,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2023-12-02 17:47:29,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:29,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2023-12-02 17:47:29,556 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 59 [2023-12-02 17:47:29,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:29,556 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2023-12-02 17:47:29,556 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.608695652173913) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:29,556 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2023-12-02 17:47:29,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 17:47:29,557 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:29,557 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1] [2023-12-02 17:47:29,562 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 17:47:29,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:29,757 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:29,758 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:29,758 INFO L85 PathProgramCache]: Analyzing trace with hash 672574943, now seen corresponding path program 12 times [2023-12-02 17:47:29,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:29,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83183389] [2023-12-02 17:47:29,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:29,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:29,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:30,883 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:30,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:30,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83183389] [2023-12-02 17:47:30,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83183389] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:30,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034936508] [2023-12-02 17:47:30,884 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:47:30,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:30,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:30,884 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:30,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 17:47:31,022 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:47:31,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:31,026 INFO L262 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 17:47:31,028 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:31,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 17:47:32,706 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 262 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:32,706 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:35,542 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 100 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:35,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034936508] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:35,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007691677] [2023-12-02 17:47:35,544 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:35,544 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:35,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:35,544 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:35,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:35,974 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:37,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5496#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:37,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:37,126 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:37,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 24] total 75 [2023-12-02 17:47:37,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692064486] [2023-12-02 17:47:37,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:37,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2023-12-02 17:47:37,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:37,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2023-12-02 17:47:37,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=6721, Unknown=0, NotChecked=0, Total=7140 [2023-12-02 17:47:37,128 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 77 states, 76 states have (on average 2.4078947368421053) internal successors, (183), 76 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:40,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:40,022 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2023-12-02 17:47:40,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 17:47:40,022 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 2.4078947368421053) internal successors, (183), 76 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2023-12-02 17:47:40,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:40,023 INFO L225 Difference]: With dead ends: 76 [2023-12-02 17:47:40,023 INFO L226 Difference]: Without dead ends: 76 [2023-12-02 17:47:40,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2709 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1139, Invalid=12201, Unknown=0, NotChecked=0, Total=13340 [2023-12-02 17:47:40,024 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 81 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 2233 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 2248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 2233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:40,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 353 Invalid, 2248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 2233 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 17:47:40,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-12-02 17:47:40,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 66. [2023-12-02 17:47:40,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:40,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2023-12-02 17:47:40,027 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2023-12-02 17:47:40,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:40,027 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2023-12-02 17:47:40,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 2.4078947368421053) internal successors, (183), 76 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:40,027 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2023-12-02 17:47:40,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 17:47:40,028 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:40,028 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2023-12-02 17:47:40,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-12-02 17:47:40,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:40,229 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:40,229 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:40,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1086120751, now seen corresponding path program 13 times [2023-12-02 17:47:40,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:40,229 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770442298] [2023-12-02 17:47:40,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:40,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:40,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:40,732 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:40,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:40,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770442298] [2023-12-02 17:47:40,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770442298] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:40,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255437250] [2023-12-02 17:47:40,732 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:47:40,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:40,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:40,733 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:40,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 17:47:40,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:40,930 INFO L262 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 17:47:40,933 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:41,040 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:41,040 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:41,779 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 20 proven. 280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:41,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255437250] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:41,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [607437607] [2023-12-02 17:47:41,781 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:41,782 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:41,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:41,782 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:41,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:42,161 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:43,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6142#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:43,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:43,009 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:43,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2023-12-02 17:47:43,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951970393] [2023-12-02 17:47:43,009 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:43,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 17:47:43,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:43,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 17:47:43,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3152, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 17:47:43,011 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:44,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:47:44,152 INFO L93 Difference]: Finished difference Result 110 states and 111 transitions. [2023-12-02 17:47:44,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 17:47:44,153 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2023-12-02 17:47:44,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:47:44,153 INFO L225 Difference]: With dead ends: 110 [2023-12-02 17:47:44,153 INFO L226 Difference]: Without dead ends: 69 [2023-12-02 17:47:44,154 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=266, Invalid=5740, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 17:47:44,154 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 43 mSDsluCounter, 954 mSDsCounter, 0 mSdLazyCounter, 1122 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 984 SdHoareTripleChecker+Invalid, 1133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 17:47:44,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 984 Invalid, 1133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1122 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 17:47:44,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-12-02 17:47:44,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2023-12-02 17:47:44,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:44,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2023-12-02 17:47:44,157 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 65 [2023-12-02 17:47:44,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:47:44,157 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2023-12-02 17:47:44,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 49 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:47:44,157 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2023-12-02 17:47:44,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 17:47:44,158 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:47:44,158 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1] [2023-12-02 17:47:44,163 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 17:47:44,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:44,358 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:47:44,359 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:47:44,359 INFO L85 PathProgramCache]: Analyzing trace with hash 134295587, now seen corresponding path program 14 times [2023-12-02 17:47:44,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:47:44,359 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130380063] [2023-12-02 17:47:44,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:47:44,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:47:44,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:47:45,904 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:47:45,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:47:45,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130380063] [2023-12-02 17:47:45,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [130380063] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:47:45,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518387682] [2023-12-02 17:47:45,904 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:47:45,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:47:45,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:47:45,905 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:47:45,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 17:47:46,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-12-02 17:47:46,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:47:46,408 INFO L262 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 124 conjunts are in the unsatisfiable core [2023-12-02 17:47:46,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:47:46,430 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:47:49,575 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 18 proven. 231 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 17:47:49,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:47:54,340 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 17 proven. 279 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 17:47:54,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518387682] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:47:54,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60165274] [2023-12-02 17:47:54,341 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:47:54,341 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:47:54,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:47:54,342 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:47:54,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:47:54,740 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:47:56,364 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6861#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:47:56,364 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:47:56,364 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:47:56,364 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 31, 35] total 95 [2023-12-02 17:47:56,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359131093] [2023-12-02 17:47:56,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:47:56,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-12-02 17:47:56,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:47:56,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-12-02 17:47:56,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=892, Invalid=10028, Unknown=0, NotChecked=0, Total=10920 [2023-12-02 17:47:56,366 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 97 states, 96 states have (on average 1.8541666666666667) internal successors, (178), 96 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:20,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:48:20,184 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2023-12-02 17:48:20,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2023-12-02 17:48:20,184 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 1.8541666666666667) internal successors, (178), 96 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2023-12-02 17:48:20,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:48:20,185 INFO L225 Difference]: With dead ends: 156 [2023-12-02 17:48:20,186 INFO L226 Difference]: Without dead ends: 156 [2023-12-02 17:48:20,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8443 ImplicationChecksByTransitivity, 29.9s TimeCoverageRelationStatistics Valid=4548, Invalid=41034, Unknown=0, NotChecked=0, Total=45582 [2023-12-02 17:48:20,188 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 611 mSDsluCounter, 424 mSDsCounter, 0 mSdLazyCounter, 3231 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 3275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 3231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-12-02 17:48:20,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [611 Valid, 433 Invalid, 3275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 3231 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-12-02 17:48:20,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-12-02 17:48:20,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 112. [2023-12-02 17:48:20,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.018018018018018) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:20,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2023-12-02 17:48:20,190 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 67 [2023-12-02 17:48:20,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:48:20,191 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2023-12-02 17:48:20,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 1.8541666666666667) internal successors, (178), 96 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:20,191 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2023-12-02 17:48:20,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 17:48:20,192 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:48:20,192 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 11, 11, 1, 1, 1, 1] [2023-12-02 17:48:20,197 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 17:48:20,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 17:48:20,392 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:48:20,393 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:48:20,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1334186103, now seen corresponding path program 15 times [2023-12-02 17:48:20,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:48:20,393 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637211827] [2023-12-02 17:48:20,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:20,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:48:20,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:48:21,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 462 proven. 341 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2023-12-02 17:48:21,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:48:21,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637211827] [2023-12-02 17:48:21,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637211827] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:48:21,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402844977] [2023-12-02 17:48:21,107 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:48:21,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:21,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:48:21,108 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:48:21,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 17:48:21,464 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:48:21,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:48:21,469 INFO L262 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 105 conjunts are in the unsatisfiable core [2023-12-02 17:48:21,472 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:48:21,480 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:48:21,965 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 17:48:22,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 823 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:48:22,688 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:48:24,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1003 backedges. 842 proven. 161 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:48:24,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402844977] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:48:24,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [935005306] [2023-12-02 17:48:24,227 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:48:24,227 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:48:24,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:48:24,228 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:48:24,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:48:24,650 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:48:25,953 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8105#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:48:25,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:48:25,953 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:48:25,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 38, 38] total 89 [2023-12-02 17:48:25,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873615010] [2023-12-02 17:48:25,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:48:25,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2023-12-02 17:48:25,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:48:25,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2023-12-02 17:48:25,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=805, Invalid=8701, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 17:48:25,955 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 90 states, 90 states have (on average 2.7333333333333334) internal successors, (246), 89 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:33,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:48:33,766 INFO L93 Difference]: Finished difference Result 260 states and 269 transitions. [2023-12-02 17:48:33,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2023-12-02 17:48:33,767 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 2.7333333333333334) internal successors, (246), 89 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2023-12-02 17:48:33,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:48:33,768 INFO L225 Difference]: With dead ends: 260 [2023-12-02 17:48:33,768 INFO L226 Difference]: Without dead ends: 132 [2023-12-02 17:48:33,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 250 SyntacticMatches, 11 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6767 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=3728, Invalid=23332, Unknown=0, NotChecked=0, Total=27060 [2023-12-02 17:48:33,770 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 199 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 2544 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 2675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 2544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:48:33,770 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 527 Invalid, 2675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 2544 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 17:48:33,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-12-02 17:48:33,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2023-12-02 17:48:33,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:33,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2023-12-02 17:48:33,773 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 111 [2023-12-02 17:48:33,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:48:33,773 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2023-12-02 17:48:33,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 2.7333333333333334) internal successors, (246), 89 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:33,774 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2023-12-02 17:48:33,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-12-02 17:48:33,775 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:48:33,775 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 1, 1, 1, 1] [2023-12-02 17:48:33,781 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 17:48:33,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 17:48:33,976 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:48:33,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:48:33,976 INFO L85 PathProgramCache]: Analyzing trace with hash 873751357, now seen corresponding path program 16 times [2023-12-02 17:48:33,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:48:33,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563053747] [2023-12-02 17:48:33,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:33,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:48:34,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:48:35,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1323 backedges. 42 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:48:35,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:48:35,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563053747] [2023-12-02 17:48:35,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563053747] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:48:35,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407859667] [2023-12-02 17:48:35,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:48:35,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:35,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:48:35,483 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:48:35,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 17:48:36,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:48:36,601 INFO L262 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 92 conjunts are in the unsatisfiable core [2023-12-02 17:48:36,604 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:48:36,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1323 backedges. 42 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:48:36,768 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:48:39,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1323 backedges. 42 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:48:39,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407859667] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:48:39,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604692591] [2023-12-02 17:48:39,275 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:48:39,275 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:48:39,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:48:39,276 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:48:39,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:48:39,668 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:48:40,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9513#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:48:40,888 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:48:40,888 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:48:40,888 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 93 [2023-12-02 17:48:40,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485925744] [2023-12-02 17:48:40,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:48:40,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2023-12-02 17:48:40,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:48:40,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2023-12-02 17:48:40,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=10038, Unknown=0, NotChecked=0, Total=10302 [2023-12-02 17:48:40,891 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 94 states, 94 states have (on average 2.8085106382978724) internal successors, (264), 93 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:44,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:48:44,925 INFO L93 Difference]: Finished difference Result 220 states and 221 transitions. [2023-12-02 17:48:44,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2023-12-02 17:48:44,925 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.8085106382978724) internal successors, (264), 93 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2023-12-02 17:48:44,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:48:44,927 INFO L225 Difference]: With dead ends: 220 [2023-12-02 17:48:44,927 INFO L226 Difference]: Without dead ends: 135 [2023-12-02 17:48:44,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2688 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=497, Invalid=20095, Unknown=0, NotChecked=0, Total=20592 [2023-12-02 17:48:44,928 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 171 mSDsluCounter, 4279 mSDsCounter, 0 mSdLazyCounter, 4680 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 4342 SdHoareTripleChecker+Invalid, 4703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 4680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-12-02 17:48:44,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 4342 Invalid, 4703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 4680 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-12-02 17:48:44,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-12-02 17:48:44,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2023-12-02 17:48:44,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.0150375939849625) internal successors, (135), 133 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:44,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2023-12-02 17:48:44,932 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 131 [2023-12-02 17:48:44,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:48:44,933 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2023-12-02 17:48:44,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.8085106382978724) internal successors, (264), 93 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:48:44,933 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2023-12-02 17:48:44,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-12-02 17:48:44,934 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:48:44,934 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 1, 1, 1, 1] [2023-12-02 17:48:44,942 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 17:48:45,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 17:48:45,135 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:48:45,135 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:48:45,135 INFO L85 PathProgramCache]: Analyzing trace with hash 360405519, now seen corresponding path program 17 times [2023-12-02 17:48:45,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:48:45,135 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856855240] [2023-12-02 17:48:45,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:48:45,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:48:45,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:48:48,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 0 proven. 1366 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:48:48,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:48:48,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856855240] [2023-12-02 17:48:48,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856855240] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:48:48,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518183520] [2023-12-02 17:48:48,371 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:48:48,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:48:48,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:48:48,372 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:48:48,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 17:48:59,596 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2023-12-02 17:48:59,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:48:59,610 INFO L262 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 179 conjunts are in the unsatisfiable core [2023-12-02 17:48:59,614 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:48:59,623 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:49:08,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 41 proven. 945 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2023-12-02 17:49:08,041 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:49:18,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 61 proven. 925 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2023-12-02 17:49:18,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518183520] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:49:18,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1671870835] [2023-12-02 17:49:18,921 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:49:18,921 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:49:18,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:49:18,921 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:49:18,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:49:19,340 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:49:21,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10910#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:49:21,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:49:21,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:49:21,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 53, 53] total 157 [2023-12-02 17:49:21,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075540707] [2023-12-02 17:49:21,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:49:21,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2023-12-02 17:49:21,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:49:21,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2023-12-02 17:49:21,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2056, Invalid=25666, Unknown=0, NotChecked=0, Total=27722 [2023-12-02 17:49:21,858 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand has 159 states, 158 states have (on average 2.0569620253164556) internal successors, (325), 158 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:27,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:51:27,452 INFO L93 Difference]: Finished difference Result 310 states and 312 transitions. [2023-12-02 17:51:27,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 223 states. [2023-12-02 17:51:27,452 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 158 states have (on average 2.0569620253164556) internal successors, (325), 158 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 133 [2023-12-02 17:51:27,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:51:27,454 INFO L225 Difference]: With dead ends: 310 [2023-12-02 17:51:27,454 INFO L226 Difference]: Without dead ends: 310 [2023-12-02 17:51:27,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29716 ImplicationChecksByTransitivity, 138.1s TimeCoverageRelationStatistics Valid=12841, Invalid=136541, Unknown=0, NotChecked=0, Total=149382 [2023-12-02 17:51:27,461 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 716 mSDsluCounter, 1653 mSDsCounter, 0 mSdLazyCounter, 10051 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 716 SdHoareTripleChecker+Valid, 1673 SdHoareTripleChecker+Invalid, 10203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 10051 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:51:27,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [716 Valid, 1673 Invalid, 10203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 10051 Invalid, 0 Unknown, 0 Unchecked, 7.6s Time] [2023-12-02 17:51:27,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2023-12-02 17:51:27,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 222. [2023-12-02 17:51:27,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 221 states have (on average 1.009049773755656) internal successors, (223), 221 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:27,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2023-12-02 17:51:27,465 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 133 [2023-12-02 17:51:27,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:51:27,466 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2023-12-02 17:51:27,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 158 states have (on average 2.0569620253164556) internal successors, (325), 158 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:51:27,466 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2023-12-02 17:51:27,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2023-12-02 17:51:27,467 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:51:27,467 INFO L195 NwaCegarLoop]: trace histogram [44, 43, 43, 43, 22, 22, 1, 1, 1, 1] [2023-12-02 17:51:27,477 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 17:51:27,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 17:51:27,668 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:51:27,668 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:51:27,668 INFO L85 PathProgramCache]: Analyzing trace with hash 323908571, now seen corresponding path program 18 times [2023-12-02 17:51:27,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:51:27,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101321311] [2023-12-02 17:51:27,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:51:27,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:51:27,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:51:29,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 1892 proven. 1408 refuted. 0 times theorem prover too weak. 882 trivial. 0 not checked. [2023-12-02 17:51:29,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:51:29,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101321311] [2023-12-02 17:51:29,817 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101321311] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:51:29,817 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017302385] [2023-12-02 17:51:29,817 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:51:29,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:51:29,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:51:29,818 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:51:29,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 17:51:35,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:51:35,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:51:35,724 INFO L262 TraceCheckSpWp]: Trace formula consists of 1211 conjuncts, 127 conjunts are in the unsatisfiable core [2023-12-02 17:51:35,730 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:51:35,737 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 17:51:37,190 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-12-02 17:51:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 3573 proven. 609 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:51:39,850 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:51:44,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 3614 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:51:44,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017302385] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:51:44,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [912510345] [2023-12-02 17:51:44,779 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:51:44,779 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:51:44,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:51:44,779 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:51:44,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:51:45,201 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:51:47,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13377#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:51:47,138 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:51:47,138 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:51:47,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 71, 71] total 166 [2023-12-02 17:51:47,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855325362] [2023-12-02 17:51:47,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:51:47,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2023-12-02 17:51:47,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:51:47,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2023-12-02 17:51:47,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2873, Invalid=27577, Unknown=0, NotChecked=0, Total=30450 [2023-12-02 17:51:47,142 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand has 167 states, 167 states have (on average 2.9221556886227544) internal successors, (488), 166 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:52:24,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:52:24,066 INFO L93 Difference]: Finished difference Result 524 states and 544 transitions. [2023-12-02 17:52:24,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2023-12-02 17:52:24,067 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 2.9221556886227544) internal successors, (488), 166 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 221 [2023-12-02 17:52:24,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:52:24,069 INFO L225 Difference]: With dead ends: 524 [2023-12-02 17:52:24,069 INFO L226 Difference]: Without dead ends: 264 [2023-12-02 17:52:24,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 514 SyntacticMatches, 22 SemanticMatches, 306 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24892 ImplicationChecksByTransitivity, 44.0s TimeCoverageRelationStatistics Valid=13782, Invalid=80774, Unknown=0, NotChecked=0, Total=94556 [2023-12-02 17:52:24,075 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 415 mSDsluCounter, 1590 mSDsCounter, 0 mSdLazyCounter, 7900 mSolverCounterSat, 526 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 1613 SdHoareTripleChecker+Invalid, 8426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 526 IncrementalHoareTripleChecker+Valid, 7900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2023-12-02 17:52:24,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [415 Valid, 1613 Invalid, 8426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [526 Valid, 7900 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2023-12-02 17:52:24,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2023-12-02 17:52:24,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2023-12-02 17:52:24,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 1.0076045627376427) internal successors, (265), 263 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:52:24,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 265 transitions. [2023-12-02 17:52:24,081 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 265 transitions. Word has length 221 [2023-12-02 17:52:24,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:52:24,081 INFO L495 AbstractCegarLoop]: Abstraction has 264 states and 265 transitions. [2023-12-02 17:52:24,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 2.9221556886227544) internal successors, (488), 166 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:52:24,081 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 265 transitions. [2023-12-02 17:52:24,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2023-12-02 17:52:24,082 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:52:24,082 INFO L195 NwaCegarLoop]: trace histogram [44, 43, 43, 43, 43, 43, 1, 1, 1, 1] [2023-12-02 17:52:24,090 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 17:52:24,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 17:52:24,283 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:52:24,283 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:52:24,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1645571477, now seen corresponding path program 19 times [2023-12-02 17:52:24,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:52:24,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407571739] [2023-12-02 17:52:24,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:52:24,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:52:24,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:52:29,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5547 backedges. 86 proven. 5461 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:52:29,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:52:29,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407571739] [2023-12-02 17:52:29,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407571739] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:52:29,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [477815923] [2023-12-02 17:52:29,637 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:52:29,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:52:29,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:52:29,638 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:52:29,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 17:52:35,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:52:35,996 INFO L262 TraceCheckSpWp]: Trace formula consists of 1484 conjuncts, 180 conjunts are in the unsatisfiable core [2023-12-02 17:52:36,000 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:52:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 5547 backedges. 86 proven. 5461 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:52:36,346 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:52:46,248 INFO L134 CoverageAnalysis]: Checked inductivity of 5547 backedges. 86 proven. 5461 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:52:46,248 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [477815923] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:52:46,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [35095433] [2023-12-02 17:52:46,249 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-12-02 17:52:46,249 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:52:46,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:52:46,250 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:52:46,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:52:46,655 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:52:49,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16193#(and (= |ULTIMATE.start_main_#t~malloc8#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_cmemrchr_#in~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (= ~MAX~0 100000) (<= 2 |ULTIMATE.start_main_~nondetArea~0#1.base|) (= |ULTIMATE.start_main_~nondetArea~0#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_~s#1.base|) (<= |ULTIMATE.start_main_~c~0#1| 2147483647) (or (< |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 0) (< (select |#length| |ULTIMATE.start_cmemrchr_#t~pre3#1.base|) (+ |ULTIMATE.start_cmemrchr_#t~pre3#1.offset| 1))) (= |ULTIMATE.start_cmemrchr_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cmemrchr_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc8#1.base|) (= |ULTIMATE.start_cmemrchr_#in~s#1.offset| 0) (<= 0 (+ |ULTIMATE.start_cmemrchr_~c#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~c~0#1| 2147483648)) (<= |ULTIMATE.start_cmemrchr_~c#1| 2147483647) (<= 2 |ULTIMATE.start_cmemrchr_~cp~0#1.base|) (<= 0 (+ |ULTIMATE.start_cmemrchr_#in~c#1| 2147483648)))' at error location [2023-12-02 17:52:49,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:52:49,066 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:52:49,066 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 181 [2023-12-02 17:52:49,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412498819] [2023-12-02 17:52:49,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:52:49,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 182 states [2023-12-02 17:52:49,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:52:49,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2023-12-02 17:52:49,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=35426, Unknown=0, NotChecked=0, Total=35910 [2023-12-02 17:52:49,069 INFO L87 Difference]: Start difference. First operand 264 states and 265 transitions. Second operand has 182 states, 182 states have (on average 2.901098901098901) internal successors, (528), 181 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:53:04,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:53:04,464 INFO L93 Difference]: Finished difference Result 440 states and 441 transitions. [2023-12-02 17:53:04,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2023-12-02 17:53:04,464 INFO L78 Accepts]: Start accepts. Automaton has has 182 states, 182 states have (on average 2.901098901098901) internal successors, (528), 181 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 263 [2023-12-02 17:53:04,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:53:04,466 INFO L225 Difference]: With dead ends: 440 [2023-12-02 17:53:04,466 INFO L226 Difference]: Without dead ends: 267 [2023-12-02 17:53:04,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 963 GetRequests, 689 SyntacticMatches, 0 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9200 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=959, Invalid=74941, Unknown=0, NotChecked=0, Total=75900 [2023-12-02 17:53:04,469 INFO L413 NwaCegarLoop]: 129 mSDtfsCounter, 175 mSDsluCounter, 16388 mSDsCounter, 0 mSdLazyCounter, 17276 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 16517 SdHoareTripleChecker+Invalid, 17320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 17276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:53:04,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 16517 Invalid, 17320 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [44 Valid, 17276 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2023-12-02 17:53:04,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2023-12-02 17:53:04,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 266. [2023-12-02 17:53:04,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.0075471698113208) internal successors, (267), 265 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:53:04,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 267 transitions. [2023-12-02 17:53:04,473 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 267 transitions. Word has length 263 [2023-12-02 17:53:04,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:53:04,474 INFO L495 AbstractCegarLoop]: Abstraction has 266 states and 267 transitions. [2023-12-02 17:53:04,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 182 states, 182 states have (on average 2.901098901098901) internal successors, (528), 181 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:53:04,474 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 267 transitions. [2023-12-02 17:53:04,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2023-12-02 17:53:04,475 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:53:04,475 INFO L195 NwaCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 1, 1, 1, 1] [2023-12-02 17:53:04,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 17:53:04,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:53:04,676 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-12-02 17:53:04,676 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:53:04,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1483836263, now seen corresponding path program 20 times [2023-12-02 17:53:04,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:53:04,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949793394] [2023-12-02 17:53:04,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:53:04,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:53:04,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:53:13,852 INFO L134 CoverageAnalysis]: Checked inductivity of 5634 backedges. 0 proven. 5634 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:53:13,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:53:13,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949793394] [2023-12-02 17:53:13,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949793394] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:53:13,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534548226] [2023-12-02 17:53:13,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:53:13,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:53:13,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:53:13,854 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:53:13,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa79c309-d74c-4248-909d-8cd3f7f5a200/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process